Ultra-brilliance isolated attosecond gamma-ray light source from nonlinear Compton scattering Peking University: Jinqing Yu, Ronghao Hu, Haiyang Lu & Xueqing Yan Imperial College London: Z. Najmudin University of California, Irvine: T. Tajima 3rd European Advanced Accelerator Concepts Workshop

Shorter duration Attosecond physics started in 21 century! Attosecond region P. B. Corkum, Nature Physics (2007)

Applications of Attosecond light source Temporal resolution in fs/as scale Molecular dynamics Well-controlled pump-probe experiments Coherent Diffractive Imaging Holographic Imaging Zoneplate Imaging Inner-shell probe, never reached before

Outer/inner shell dynamics, never reached before Blank area F. Krausz, M. Ivanov Review of Modern Physics 81, 163 (2009)

The γ-ray for Outer/inner shell dynamics High energy photons 2. Ultra-short attosecond 3. Isolated 4. High brilliance 5. Ultra-smaller source size γ-ray

γ-ray generation experiment K. Ta Phuoc, Nature Photonics 2012

γ-ray generation experiment W. C. Yan, Nature Photonics 2017

The first attosecond γ-ray method ~4.9×1023 W/cm2 The gamma source duration was 830 as; The brilliance was ~3×1020 Photons s-1 mrad-2 mm-2 0.1%BW. 10PW lasers are still under construction! Jianxing Li, PRL (2015)

Ultrahigh intensity laser facilities ICUIL 2011

Compact LAser Plasma Accelerator @Peking Uni. 2) FEL beam line 3)Cluster-target Chamber CLAPA Laser Parameters Pulse Energy: 5 J Pulse Duration: < 25 fs /5Hz Wavelength: 800 nm Contrast Ratio: 1010:1 @ 100 ps 109:1 @ 20 ps 106:1 @ 5 ps 103:1 @ 1 ps 1)Proton Irradiation Platform for Animals Proton Beam Line Laser Ok, At the beginning of my talk, I want give some words to our new lab. This is our new laser lab, just finished last year. It’s a 200 TW laser system. On in this laser, we are studying ion acceleration, electron acceleration and high quality gamma-ray generation.

Attosecond γ-ray pulse generation As we can see from the reported studies, almost all the angle is larger than 30 degree. So is there any reported method to reduce the divergence angle of the γ-ray source? The answer is yes. How to produce attosecond γ-ray pulse with current 100TW class lasers ???

Gamma pulse duration in Compton mechanism The radiation duration is dominated by electron bunch duration or laser pulse duration; It is possible to generate attosecond radiation by the interaction between attosecond electron bunch and short laser pulse.

Gamma pulse duration in Compton mechanism Two key points need to be overcame! How to generate isolated attosecond electron bunch? How to control the collision point?

How to generate isolated attosecond electron bunch? N. Naumova, Attosecond Electron Bunches, PRL, 2004 T.V. Liseykina, PRL, 2010

How to generate isolated attosecond electron bunch? 5 fs laser !

How to generate isolated attosecond electron bunch? M. J. H. Luttikhof, PRL, 2010

How to generate isolated attosecond electron bunch? F.Y. Li & Z. M. Sheng, PRL, 2014

How to control the collision point ？ Change gas jet size and gas pressure to control the injection and collision point.

The PIC code epoch T. D. Arber, et al., 2015

Self-balance injection Spot size and a VS. time Self-balance injection Jinqing Yu, et al. Submitted 2016

Generation of as electron bunch Jinqing Yu, et al. Submitted 2016

Generation of as photon bunch Photon number 2.4e10 Jinqing Yu, et al. Submitted 2016

Generation of as gamma(>100KeV) bunch Gamma location vs. spread angle at different time, Ngamma> 3.6e9 The gamma-ray brilliance is > 1.0e24 /(sec * mrad2 * mm2 * 0.1%BW) Jinqing Yu, et al. Submitted 2016

Brilliance Our work Sarri G. Sarri, et al. PRL 2014 Jinqing Yu, et al. Submitted 2016

Conclusion We propose a method to generated <100 attosecond Gamma-ray pulse driven by ~100 TW laser; The brilliance of the Gamma-ray is >1.0e24 /(sec * mrad2 * mm2 * 0.1%BW) ; The brilliance is two orders of magnitude higher than the record result; Would open the window to study nuclear dynamics. Jinqing Yu, et al. Submitted 2017

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